I have a recently rebuilt 518, makes alot of clunking noises, and recently been taking longer than normal to pickup oil after stitting for a day. there is a backcheck valve for the torque converter already. i've seen on here over filling is suggested. what are others thoughts. And i am wanting to add a fuel pin. i've heard that M2 are the best all around, i was thinking middle of the road (M3) but i dont want to over do it. wont pull a big trailer too much, mainly an 18' car trailer with a compact tractor etc. what pin do you have, let me know how you guys like it, or suggestions. thanks to all

 

I put Denny T's stage 2 pin and love it. Very little smoke and great power. Price I think was just over a 100 bucks so very reasonable too!!